As a renewable and environment-friendly technology for seawater desalination and wastewater purification, solar energy triggered steam generation is attractive to address the long-standing global water scarcity issues. However, practical utilization of solar energy for steam generation is severely restricted by the complex synthesis, low energy conversion efficiency, insufficient solar spectrum absorption and water extraction capability of state-of-the-art technologies. Here, for the first time, we report a facile strategy to realize hydrogen bond induced self-assembly of a polydopamine (PDA)@MXene microsphere photothermal layer for synergistically achieving wide-spectrum and highly efficient solar absorption capability (≈ 96% in a wide solar spectrum range of 250–1,500 nm wavelength). Moreover, such a system renders fast water transport and vapor escaping due to the intrinsically hydrophilic nature of both MXene and PDA, as well as the interspacing between core-shell microspheres. The solar-to-vapor conversion efficiencies under the solar illumination of 1 sun and 4 sun are as high as 85.2% and 93.6%, respectively. Besides, the PDA@MXene photothermal layer renders the system durable mechanical properties, allowing producing clean water from seawater with the salt rejection rate beyond 99%. Furthermore, stable light absorption performance can be achieved and well maintained due to the formation of ternary TiO2/C/MXene complex caused by oxidative degradation of MXene. Therefore, this work proposes an attractive MXene-assisted strategy for fabricating high performance photothermal composites for advanced solar-driven seawater desalination applications.

中文翻译：

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自组装核壳聚多巴胺@MXene，具有协同吸收太阳光的能力，可高效产生太阳气

作为用于海水淡化和废水净化的可再生环保技术，太阳能引发的蒸汽产生对于解决长期存在的全球水资源短缺问题具有吸引力。然而，由于现有技术的复杂合成，低能量转换效率，不足的太阳光谱吸收和水提取能力，严重限制了太阳能在蒸汽产生中的实际利用。在这里，我们首次报告了一种简便的策略，以实现氢键诱导的聚多巴胺（PDA）@MXene微球光热层的自组装，以协同实现宽光谱和高效的太阳吸收能力（在宽广的区域中≈96％太阳光谱范围为250–1,500 nm波长）。而且，由于MXene和PDA的固有亲水性以及核-壳微球之间的间隔，这种系统可实现快速的水传输和蒸气逸出。在1个太阳和4个太阳的太阳照射下，太阳到蒸气的转换效率分别高达85.2％和93.6％。此外，PDA @ MXene光热层使系统具有持久的机械性能，从而可以从海水中产生脱盐率超过99％的纯净水。此外，由于由MXene的氧化降解引起的三元TiO2 / C / MXene配合物的形成，可以实现并很好地保持稳定的光吸收性能。所以，